Frost dates for 57735Edgemont, SD
The average last spring frost in Edgemont is May 23 and the average first fall frost is September 20, giving a typical growing season of about 117 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- May 23
- Average first fall frost
- Sep 20
- Growing season
- 117 days
Safer after Jun 7 (1-in-10 risk)
Possible by Sep 6 (1-in-10 risk)
Last frost typically in 208 days
Frost risk by date
NOAA reports frost dates as probabilities. The middle date is the average (a 50% chance). For spring, the 10% date is a safer planting date: frost after it happens in about 1 year in 10. Light frost (36°F) can damage tender plants; a hard freeze (28°F) kills most annuals.
| Temperature | Last spring: 90% / 50% / 10% chance | First fall: 10% / 50% / 90% chance | Growing season (50%) | Years with at least one |
|---|---|---|---|---|
| Light frost (36°F) | May 22 · Jun 4 · Jun 21 | Aug 28 · Sep 10 · Sep 23 | 97 days | 100% |
| Frost / freeze (32°F) | May 11 · May 23 · Jun 7 | Sep 6 · Sep 20 · Oct 2 | 117 days | 100% |
| Hard freeze (28°F) | May 2 · May 13 · May 27 | Sep 15 · Sep 28 · Oct 9 | 136 days | 100% |
Planting calendar for Edgemont
Planting windows from the University of Maryland Extension calendar, shifted to your average frost dates. Use them as a starting point and adjust for seed packet instructions and local conditions.
| Crop | Task | Window |
|---|---|---|
| Tomatoes | Start seeds indoors | Apr 22 – Jun 28 |
| Tomatoes | Transplant outdoors | Jun 8 – May 31 |
| Peppers | Start seeds indoors | Apr 22 – May 23 |
| Peppers | Transplant outdoors | Jun 22 – Jul 23 |
| Eggplant | Start seeds indoors | May 9 – Jun 7 |
| Eggplant | Transplant outdoors | Jun 22 – Jul 23 |
| Cucumbers | Sow outdoors | Jun 22 – Jun 10 |
| Summer squash | Sow outdoors | Jun 8 – Jul 23 |
| Winter squash & pumpkins | Sow outdoors | Jun 22 – Jul 23 |
| Snap beans | Sow outdoors | Jun 8 – Jul 3 |
| Sweet corn | Sow outdoors | Jun 8 – May 31 |
| Watermelon & cantaloupe | Sow outdoors | Jun 22 – Jul 23 |
| Okra | Sow outdoors | Jun 15 – Jul 8 |
| Peas | Sow outdoors (spring) | Apr 22 – Jun 7 |
| Potatoes | Plant outdoors (spring) | Apr 22 – Jun 22 |
| Onions | Start seeds indoors (spring) | Mar 11 – Apr 7 |
| Onions | Transplant outdoors (spring) | May 9 – Jun 7 |
| Broccoli | Start seeds indoors (spring) | Apr 4 – May 8 |
| Broccoli | Transplant outdoors (spring) | May 9 – Jun 7 |
| Broccoli | Start seeds indoors (fall) | May 21 – May 31 |
| Broccoli | Transplant outdoors (fall) | Jun 20 – Jul 1 |
| Cabbage | Start seeds indoors (spring) | Mar 25 – Apr 22 |
| Cabbage | Transplant outdoors (spring) | Apr 22 – May 23 |
| Cabbage | Start seeds indoors (fall) | May 11 – Jun 10 |
| Cabbage | Transplant outdoors (fall) | Jun 10 – Jul 11 |
| Leaf lettuce | Sow outdoors (spring) | Apr 22 – Jul 8 |
| Leaf lettuce | Sow outdoors (fall) | Jun 10 – Jul 27 |
| Spinach | Sow outdoors (spring) | Apr 15 – May 29 |
| Spinach | Sow outdoors (fall) | Jun 27 – Aug 1 |
| Radishes | Sow outdoors (spring) | Apr 22 – Jun 12 |
| Radishes | Sow outdoors (fall) | Jun 10 – Aug 11 |
| Kale | Sow outdoors (spring) | May 9 – May 29 |
| Kale | Sow outdoors (fall) | Jun 3 – Jul 11 |
| Carrots | Sow outdoors (spring) | May 23 – Jul 8 |
| Carrots | Sow outdoors (fall) | May 11 – Jun 26 |
| Garlic | Plant outdoors (fall) | Sep 10 – Oct 11 |
Where these dates come from
ZIP code 57735 is matched to the NOAA station Edgemont, SD, 3 km away, at 3,432 ft elevation (92 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Edgemont, SD (used) | 3,432 ft | May 23 | Sep 20 |
| Ardmore 1 Nw, SD | 3,540 ft | May 16 | Sep 23 |
| Hot Springs, SD | 3,560 ft | May 16 | Sep 27 |
| Edgemont 23 Nnw, SD | 4,402 ft | May 18 | Sep 27 |
Frost dates near Edgemont
- Hot Springs, SD 57747 · last May 16, first Sep 27
- Pringle, SD 57773 · last Jun 1, first Sep 10
- Buffalo Gap, SD 57722 · last May 15, first Sep 27
- Smithwick, SD 57782 · last May 15, first Sep 30
- Oelrichs, SD 57763 · last May 15, first Sep 30
- Custer, SD 57730 · last May 15, first Sep 29
- Oral, SD 57766 · last May 15, first Sep 27
- Fairburn, SD 57738 · last May 16, first Sep 27
Frequently asked questions
- When is the last frost in Edgemont, SD?
- For ZIP code 57735, the average last spring frost (32°F) is May 23, based on NOAA 1991-2020 climate normals for the Edgemont, SD weather station. There is a 1-in-10 chance of a frost after June 7.
- When is the first frost in Edgemont, SD?
- The average first fall frost (32°F) is September 20. There is a 1-in-10 chance of frost by September 6, so tender plants are at risk from that point on.
- How long is the growing season in 57735?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 117 days long.
- Are these frost dates a forecast?
- No. They are 30-year averages and probabilities from NOAA weather station records. Use them to plan, then watch your local forecast before planting tender crops or leaving them uncovered.